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1 From the Marine Biological Laboratory, Woods'Hole, Mass., and Washington Biophysical Institute
1. A method for the effective irradiation of Arbacia eggs with measured quantities of monochromatic ultra-violet radiation is described.
2. The activation (parthenogenesis) of Arbacia eggs by polychromatic and monochromatic radiation is demonstrated.
3. The energy requirements and wave-length dependence of activation have been worked out. The wave-lengths most effective are in the shorter ultra-violet.
4. The wave-length dependence of the activation curve of Arbacia is compared with the inactivation curves for urease and the virus of typical tobacco mosaic.
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